28386705 has 16 divisors (see below), whose sum is σ = 45685440. Its totient is φ = 15050688.

The previous prime is 28386689. The next prime is 28386727. The reversal of 28386705 is 50768382.

It is not a de Polignac number, because 28386705 - 2⁴ = 28386689 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2875 + ... + 8064.

It is an arithmetic number, because the mean of its divisors is an integer number (2855340).

Almost surely, 2^28386705 is an apocalyptic number.

It is an amenable number.

28386705 is a deficient number, since it is larger than the sum of its proper divisors (17298735).

28386705 is a wasteful number, since it uses less digits than its factorization.

28386705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11120.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 28386705 is about 5327.9175106227. The cubic root of 28386705 is about 305.0504440439.

The spelling of 28386705 in words is "twenty-eight million, three hundred eighty-six thousand, seven hundred five".